129437225 has 6 divisors (see below), whose sum is σ = 160502190. Its totient is φ = 103549760.

The previous prime is 129437207. The next prime is 129437293. The reversal of 129437225 is 522734921.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 7268416 + 122168809 = 2696^2 + 11053^2 .

It is not a de Polignac number, because 129437225 - 2⁸ = 129436969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2588720 + ... + 2588769.

It is an arithmetic number, because the mean of its divisors is an integer number (26750365).

Almost surely, 2^129437225 is an apocalyptic number.

It is an amenable number.

129437225 is a deficient number, since it is larger than the sum of its proper divisors (31064965).

129437225 is an equidigital number, since it uses as much as digits as its factorization.

129437225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5177499 (or 5177494 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 129437225 is about 11377.0481672532. The cubic root of 129437225 is about 505.8476435175.

The spelling of 129437225 in words is "one hundred twenty-nine million, four hundred thirty-seven thousand, two hundred twenty-five".